TW202235379A - Sewage treatment method and device wherein the device includes a pretreatment structure, a first microfiltration structure, an aerobic biological reaction structure, a second microfiltration structure and a mixing and concentrating structure - Google Patents

Abstract

A sewage treatment method and device are disclosed. The method comprises the following steps: a1) treating sewage with a pretreatment structure to generate first treated water; a2) filtering the first treated water with a first microfiltration structure to generate second treated water and first sludge; a3) treating the second treated water with an aerobic biological reaction structure to generate third treated water; a4) filtering the third treated water with a second microfiltration structure to generate fourth treated water and second sludge; a5) treating the first sludge and the second sludge with a mixing and concentrating structure to generate third sludge; a6) treating the third sludge with an anaerobic biological digestion structure to generate methane and fourth sludge. The method can make the treated water meet the discharge standard, facilitate the recycling and reuse of the treated water, increase the methane production, and save land and construction costs.

Description

Sewage treatment method and device

The present invention relates to a sewage treatment method and device; in particular to a sewage treatment method and device which utilizes a first microfiltration structure and a second microfiltration structure to replace conventional primary sedimentation tanks and secondary sedimentation tanks.

The main purpose of sewage treatment is to avoid discharge water pollution and sludge reduction. Today's various sewage treatment plants can use many different sewage treatment methods and installations. Conventional sewage treatment devices generally include pretreatment structures, primary sedimentation tanks, secondary sedimentation tanks, aerobic biological treatment structures, and anaerobic biological digestion structures. It can make the final treated water comply with discharge standards or facilitate recycling and reuse. In addition, it can also reduce the amount of sludge solids and save subsequent treatment costs. Furthermore, methane can also be produced to increase economic benefits.

However, the conventional sewage treatment methods and devices also have the following deficiencies: 1. For example, the functions of structures such as coarse grids and fine grids are insufficient, and it is difficult to screen out suspended matter such as hair and lint, resulting in operational problems in subsequent treatment procedures. For example, it affects the motor, pipeline and membrane unit; 2. The solid-liquid separation effect and efficiency of the primary sedimentation tank and the secondary sedimentation tank are poor, so it is necessary to set up a large area of the primary sedimentation tank and the secondary sedimentation tank, resulting in a large area. , high cost and other issues; 3. Preliminary sedimentation tank and The solid-liquid separation effect of the secondary sedimentation tank is poor, for example, the suspended solids and grease and other sundries cannot be effectively removed, which affects the subsequent operation, especially seriously affects the treatment efficiency and methane production of the anaerobic digestion structure; 4. The primary sedimentation tank and The solid-liquid separation efficiency of the secondary sedimentation tank is poor, and it takes a long time.

In view of this, the inventor thinks hard, studies actively, adds years of experience in related product research, and through continuous testing and improvement, finally develops the present invention.

The purpose of the present invention is to provide a sewage treatment method that can make the treated water comply with the discharge standard, facilitate the recycling and reuse of the treated water, increase methane production, save land and save construction costs.

The method for achieving the above object of the present invention comprises the following steps: a1) treating sewage with a previous treatment structure to produce the first treated water; a2) filtering the first treated water with a first microfiltration structure to produce the second treated water and the first sewage Mud; the first microfiltration structure contains a first metal woven filter screen and a first circulation backwash structure; a3) processes the second treated water with an aerobic biological reaction structure to produce the third treated water; a4) uses a first The second microfiltration structure filters the third treated water to produce the fourth treated water and the second sludge; the second microfiltration structure contains a second metal braided filter screen and a second circulation backwash structure; a5) mixes and concentrates the structure processing the first sludge and the second sludge to produce the third sludge; a6) treating the third sludge with an anaerobic biological digestion structure to produce methane and the fourth sludge.

Another object of the present invention is to provide a It is a sewage treatment device that conforms to discharge standards, facilitates the recycling and reuse of treated water, increases methane production, saves land and saves construction costs.

The structure of the present invention to achieve the above object includes: a first microfiltration structure, connected to the pretreatment structure to receive the first treated water, with a first metal braided filter screen and a first circulation backwashing structure, which can filter the first A water treatment to produce the second treatment water and the first sludge; an aerobic biological reaction structure, connected to the first microfiltration structure to receive the second treatment water, capable of treating the second treatment water with an aerobic biological reaction to Generate third treated water; a second microfiltration structure, connected to the aerobic biological reaction structure to receive the third treated water, has a second metal woven filter screen and a second circulation backwashing structure, which can filter the third Treat water to produce fourth treated water and second sludge; a mixing and concentrating structure, connected to the first microfiltration structure and second microfiltration structure to receive the first sludge and second sludge, capable of mixing and concentrating The first sludge and the second sludge are used to generate the third sludge; and an anaerobic biological digestion structure connected to the mixing and thickening structure to receive the third sludge, capable of treating the third sludge with anaerobic biological digestion sludge to produce methane and fourth sludge.

Preferably, the first metal braided filter screen of the first microfiltration structure is a flat filter membrane; the first circulating backwash structure further includes: a base on which the first metal braided filter net, the first metal braided filter screen is inclined and has a high side and a low side; and a water supply component, connected to the pre-treatment structure to receive the first treated water, and then to the first metal braided filter screen The high side supplies the first treatment water, and the first treatment water flows along the first metal The high side of the woven filter screen flows to the low side, and is separated by solid and liquid to form the second treated water and the first sludge. The second treated water passes through the first metal woven filter screen, and the first sludge is collected by the The lower side direction of the first metal braided filter screen is separated; and a first collection component is used to collect the second treated water passing through the first metal braided screen; and a track is arranged on the base; A support structure is a seat body that can slide along the track, connected with a power component; and a first backwash injection structure is arranged on the first support structure and below the first metal braided filter screen, the The first backwash spraying structure has at least one spraying hole facing the first metal braided filter screen, allowing the sprayed fluid to pass through the first metal braided filter screen; and a baffle plate arranged on the first support structure , and located above the first metal braided filter screen and the first backwash injection structure; thereby increasing the efficacy of the first microfiltration structure.

Preferably, the second metal braided filter screen of the second microfiltration structure is a flat filter membrane; the second circulating backwash structure may further include: a base on which the second metal braided a filter screen, the second metal braided filter screen is inclined and has a high side and a low side; and a water supply component connected to the aerobic biological reaction structure to receive the third treated water, and then to the second metal braided The high side of the filter is supplied with the third treated water, and the third treated water flows along the high side of the second metal woven filter to the low side, and is separated from solid and liquid to form the fourth treated water and the second sludge , the fourth treated water passes through the second metal braided filter, and the second sludge is separated from the lower side of the second metal braided filter; and a first collection component is used to collect Net's first 4. Treatment water; and a track, set on the base; and a second support structure, which is a seat body that can slide along the track, connected to a power component; and a second backwash injection structure, set on the base On the second supporting structure, and located below the second metal braided filter screen; the second backwash injection structure has at least one spray hole facing the second metal braided screen, so that the sprayed fluid can pass through the second a metal braided filter screen; and a baffle plate arranged on the second support structure and located above the second metal braided filter screen and the second backwash injection structure; thereby increasing the efficacy of the second microfiltration structure.

Preferably, the first metal braided filter screen of the first microfiltration structure is tubular and has a first end, a second end and a first space; the first circulating backwashing structure may further include: a first a closed plate, located at the first end of the first metal woven filter screen, and has a first opening; and a second closed plate, located at the second end of the first metal woven filter screen; and a first support The structure is a pipe body with a first end and a second end, the first end of the first support structure is rotatably pivoted on the first closing plate; and at least one first backwash injection structure is composed of a Consisting of a first communication pipe and a first water spray pipe, the first communication pipe communicates with the first support structure and the first water spray pipe, and the first water spray pipe is arranged close to the first metal braided filter screen At the place, the wall of the first water spray pipe has many first water spray ports facing the first metal braided screen; and a backwash pump has a first water inlet pipe and a first water outlet pipe, and the first outlet pipe The water pipe communicates with the first support structure to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank is coated on the first metal braided filter In addition, there is a storage space between the first metal woven filter screen, the storage space of the storage tank is connected to the pre-treatment structure to receive the first treatment water, so that the first treatment water is separated from solid and liquid to form a second Two treated water and first sludge, the second treated water passes through the first metal woven filter, and the first sludge settles at the bottom of the storage space of the storage tank; and a water outlet pipe communicates with the first closed The first opening of the plate and the outside of the storage tank to discharge the second treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the first sludge; thereby increasing the efficiency of the first microfiltration structure effect.

Preferably, the second metal braided filter screen of the second microfiltration structure is tubular and has a first end, a second end and a first space; the second circulating backwashing structure may further include: a first a closing plate, disposed at the first end of the second metal woven filter, having a first opening; and a second closing plate, disposed at the second end of the second metal woven filter; and a second support structure , is a pipe body, has a first end and a second end, the first end of the second supporting structure is rotatably pivoted on the first closing plate; and at least one second backwash injection structure is composed of a first A communication pipe and a first water spray pipe; the first communication pipe communicates with the second support structure and the first water spray pipe, and the first water spray pipe is arranged near the second metal braided filter ; The pipe wall of the first water spray pipe has many first water spray ports facing the second metal braided filter screen; and a backwash pump has a first water inlet pipe and a first water outlet pipe, and the first water outlet pipe communicate with the second support structure to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank is covered on the second metal braided filter screen In addition, there is a storage space between the second metal woven filter screen, the storage space of the storage tank is connected to the aerobic biological reaction structure to receive the third treated water, so that the third treated water is separated from solid and liquid Forming fourth treated water and second sludge, the fourth treated water passes through the second metal woven filter screen, and the second sludge settles at the bottom of the storage space of the storage tank; and a water outlet pipe communicates with the first a first opening of the closing plate and the outside of the storage tank to discharge the fourth treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the second sludge; thereby increasing the second microfiltration The efficacy of the structure.

In order to achieve the above and other objects of the present invention, the technical means, components and effects thereof adopted are illustrated below in a preferred embodiment.

100: Sewage treatment plant

1: Pre-processing structure

11: Sewage source

2, 2a, 2b: the first microfiltration structure

21, 21a, 21b: the first metal braided filter screen

211a: high side

212a: low side

213b: first end

214b: second end

215b: The first space

22, 22a, 22b: first cycle backwash structure

221, 221a, 221b: the first backwash injection structure

2211: spray hole

2212b: The first connecting pipe

2213b: The first sprinkler pipe

222, 222a, 222b: first support structure

2221b: first end

2222b: second end

223a: base

224a: Water supply components

225a: first collection component

226a: track

227a: Baffle

228b: the first closed plate

2281b: first opening

229b: second closing plate

230b: Backwash pump

2301b: The first water inlet pipe

2302b: The first outlet pipe

231b: storage tank

2311b: storage space

232b: Outlet pipe

233b: Sewage pipe

3: Aerobic biological reaction structure

4, 4a, 4b: the second microfiltration structure

41, 41a, 41b: the second metal braided filter screen

411a: high side

412a: low side

413b: first end

414b: second end

415b: The first space

42, 42a, 42b: second cycle backwash structure

421, 421a, 421b: second backwash injection structure

4212b: The first connecting pipe

4213b: The first sprinkler pipe

422, 422a, 422b: Second support structure

4221b: first end

4222b: second end

423a: base

424a: Water Supply Assembly

425a: first collection component

426a: track

427a: Baffle

428b: first closing plate

4281b: first opening

429b: second closure plate

430b: Backwash pump

4301b: The first water inlet pipe

4302b: The first outlet pipe

431b: storage tank

4311b: storage space

432b: Outlet pipe

433b: Sewage pipe

5: Mixed and concentrated structure

6: Anaerobic biological digestion structure

[ Fig. 1 ] is a block diagram of the present invention.

[ Fig. 2 ] is a perspective view of the first microfiltration structure of the present invention.

[ Fig. 3 ] is a side view of the first microfiltration structure of the present invention.

[ Fig. 4 ] is a schematic diagram of most or all structures of the first backwash injection structure in cooperation with the first support structure to cyclically backwash the first metal braided filter screen of the present invention.

[ Fig. 5 ] is a perspective view of the second microfiltration structure of the present invention.

[ Fig. 6 ] is a schematic diagram of a first variation example of the first microfiltration structure of the present invention.

[ Fig. 7 ] is a schematic diagram of a first variation example of the second microfiltration structure of the present invention.

[ Fig. 8 ] is a schematic diagram of a second variation example of the first microfiltration structure of the present invention.

[ Fig. 9 ] is a schematic diagram of a second variation example of the second microfiltration structure of the present invention.

The sewage treatment method of the present invention comprises the following steps: a1) treating sewage with a previous treatment structure to produce first treated water; a2) filtering the first treated water with a first microfiltration structure to produce second treated water and first sludge ; The first microfiltration structure contains a first metal woven filter screen and a first circulation backwash structure; a3) processes the second treated water with an aerobic biological reaction structure to generate the third treated water; a4) uses a second The microfiltration structure filters the third treated water to produce the fourth treated water and the second sludge; the second microfiltration structure contains a second metal woven filter screen and a second circulation backwash structure; a5) is treated with a mixing and concentration structure The first sludge and the second sludge produce the third sludge; a6) treat the third sludge with an anaerobic biological digestion structure to produce methane and the fourth sludge; by this method, the treated water can be discharged in accordance with the requirements Standards, convenient treatment of water recycling and reuse, increase methane production, save land and save construction costs, etc. It will be explained in detail below.

Figures 1 to 5 show a sewage treatment device 100 that can carry out the aforementioned sewage treatment method. The sewage treatment device 100 includes: a pre-treatment structure 1 connected to a sewage source 11, which can treat the sewage of the sewage source 11 and Produce the first treated water; a first microfiltration structure 2, connected to the pre-treatment structure 1 to receive the first treated water, has a first metal braided filter screen 21 and a first circulating backwashing structure 22, which can handle the first treatment water to produce the second treated water and the first sludge; an aerobic biological reaction structure 3, connected to the first microfiltration structure 2 to receive the second treated water, can treat the second treated water with aerobic biological reaction to produce the third treated water; a second microfiltration structure 4. Connect the aerobic biological reaction structure 3 to receive the third treated water, with a second metal braided filter screen 41 and a second circulation backwash structure 42, which can treat the third treated water to produce the fourth treated water and the second treated water Sludge; a mixing and thickening structure 5, connected to the first microfiltration structure 2 and the second microfiltration structure 4 to receive the first sludge and the second sludge, capable of mixing and concentrating the first sludge and the second sludge to generating third sludge; and an anaerobic biological digestion structure 6 connected to the mixing and thickening structure 5 to receive the third sludge, which can be treated with anaerobic biological digestion to produce methane and fourth sludge.

Step a1) is to treat the sewage with the previous treatment structure 1 to generate the first treated water. The pre-treatment structure 1 is connected to a sewage source 11, and can treat the sewage of the sewage source to generate first treated water. The pre-treatment structure 1 may include one or more of structures such as coarse grids, fine grids, vortex grit structures and/or aerated grit structures, and is mainly used to filter large debris and heavier impurities in sewage. Gravel is a conventional technology, so it will not be described in detail.

Step a2) is to filter the first treated water with a first microfiltration structure 2 to produce second treated water and first sludge; the first microfiltration structure 2 contains a first metal braided filter screen 21 and a first circulation reactor Flush structure 22. The first micro-filtration structure 2 is connected to the pre-treatment structure 1 to receive the first treated water, and it can filter and treat the first treated water by sweeping flow.

The first circulating backwashing structure 22 may have a first backwashing injection structure 221 and a first supporting structure 222 . The first backwash injection structure 221 is mainly used to inject fluids such as gas or liquid, and a fluid injection structure can be used, for example, there are many injection holes 2211 towards the first metal braided filter screen 21 The pipe body may consist of more than one spray head (not shown in the figure). The feature of the first backwash injection structure 221 is that only backwash a part of the structure of the first metal braided filter screen 21, and can cooperate with the first support structure 222 to cycle backwash most or all of the first metal braided filter screen 21 (such as 4); with this structure, backwashing can be carried out together when the first metal braided filter screen 21 filters the first treated water.

Step a3) is to treat the second treated water with an aerobic biological reaction structure 3 to generate third treated water. The aerobic biological reaction structure 3 is connected to the first microfiltration structure 2 to receive the second treated water, and the dissolved organic matter in the water can be purified by aerobic biology, which is a conventional technology, so it will not be described again.

Step a4) is to filter the third treated water with a second microfiltration structure 4 to produce fourth treated water and second sludge. The second microfiltration structure 4 can adopt substantially the same structure as the first microfiltration structure 2, which contains a second metal braided filter screen 41 and a second circulation backwash structure 42, and the second circulation backwash structure 42 can have Structures such as at least one second backwash injection structure 421 and a second support structure 422 . The second microfiltration structure 4 is connected to the aerobic biological reaction structure 3 to receive the third treated water, which can filter and treat the third treated water by sweep flow, and then generate the fourth treated water. The fourth treated water generated through the aforementioned steps can already meet the discharge standard, and can also be released after post-treatment such as disinfection if necessary, and can also be recycled and reused.

The first metal woven filter screen 21 and the second metal woven filter screen 41 of the first microfiltration structure 2 and the second microfiltration structure 4 are all films of microfiltration grade, which can Choose different meshes and pore diameters (not shown in the figure) in response to, for example, different sewage conditions.

As mentioned above, the second microfiltration structure 4 can adopt roughly the same structure as the first microfiltration structure 2, and the difference is that the conditions of the first treated water and the third treated water to be filtered are different, so different filter structures can be selected. Mesh and pore size (not shown in the figure), for example, the mesh number can be 400~500mesh (mesh number) and the first metal woven filter screen with a pore size of 30~38 μm (micron), and the mesh number can be 200~ 500mesh (mesh number) and a second metal braided filter screen (not shown in the figure) with a pore size of 25-75 μm (micrometer).

Step a5) is to process the first sludge and the second sludge with the mixing and thickening structure 5 to generate the third sludge. The mixing and concentrating structure 5 is connected to the first microfiltration structure 2 and the second microfiltration structure 4 to receive the first sludge and the second sludge, and can be composed of a mixing tank and a concentrating tank (not shown in the figure), mainly for The mixing and dehydration of sludge is a common technology, so it will not be described in detail.

Step a6) is treating the third sludge with an anaerobic biological digestion structure 6 to generate methane and fourth sludge. The anaerobic biological digestion structure 6 is connected to the mixing and concentrating structure 5 to receive the third sludge. It is applied to biodegradable wastewater and can generate methane. It is a conventional technology, so it will not be described again.

The main feature of the present invention is to use the first microfiltration structure 2 and the second microfiltration structure 4 to replace the conventional primary sedimentation tank and secondary sedimentation tank. The first microfiltration structure 2 and the second microfiltration structure 4 utilize the first circulation backwashing structure 22 and the second circulation backwashing structure 42 to perform backwashing together during filtration. The first microfiltration structure 2 and Compared with the conventional primary sedimentation tank, secondary sedimentation tank or membrane filtration structure with backwash structure, the second microfiltration structure 4 has the following advantages. 1. The first microfiltration structure 2 and the second microfiltration structure 4 adopt sweep-flow filtration without waiting for slow natural precipitation, and the filtration efficiency is high. 2. The first microfiltration structure 2 and the second microfiltration structure 4 can filter suspended substances such as cotton wool and hair, so as to prevent subsequent processing structures such as motors from being blocked by suspended substances. 3. The first microfiltration structure 2 and the second microfiltration structure 4 can increase the amount of sludge, thereby increasing the methane production of the anaerobic biological digestion structure; further, the first microfiltration structure 2 and the second microfiltration structure 4 The first metal woven filter screen 21 and the second metal woven filter screen 41 with different mesh numbers and apertures can be selected corresponding to the sewage conditions, so the amount of sludge can be increased. In addition, the first microfiltration structure 2 and the second microfiltration structure 4 It can filter suspended matter such as cotton wool and hair, and can also increase the amount of sludge. 4. The first microfiltration structure 2 and the second microfiltration structure 4 do not need to build large-scale sedimentation tanks, which can save a lot of land and construction costs. 5. The first microfiltration structure 2 and the second microfiltration structure 4 do not need to stop filtering during backwashing, and can perform filtration and backwashing at the same time, which not only increases the filtration efficiency, but also saves a lot of management costs.

Fig. 6 shows a first variant embodiment of the first microfiltration structure of the present invention. Fig. 7 shows the first variant embodiment of the second microfiltration structure of the present invention. As shown in Figures 6 to 7, the first microfiltration structure 2a and/or the second microfiltration structure 4a can further form a solid-liquid separation device (its structure can be roughly the same as that of the applicant of the present invention in Taiwan Patent Application No. 109112091, No. 109204173 discloses the same solid-liquid separation device), so as to increase the efficacy of the first microfiltration structure and the second microfiltration structure.

As shown in Figure 6, the first metal braid filter of the first microfiltration structure 2a The net 21a can be a flat filter membrane; the first circulating backwashing structure 22a can further include: a base 223a on which the first metal braided filter screen 21a is arranged; the first metal braided filter screen 21a is in an inclined state , having a high side 211a and a low side 212a; and a water supply assembly 224a, connected to the pre-treatment structure to receive the first treated water, and then supply the first treated water to the high side 211a of the first metal braided filter screen 21a , the first treated water flows along the high side 211a of the first metal braided filter screen 21a to the low side 212a, and is separated from solid and liquid to form second treated water and first sludge, and the second treated water passes through the first Metal braided filter screen 21a, the first sludge is separated from the direction of the low side 212a of the first metal braided filter screen 21a; and a first collection assembly 225a, used to collect the second treatment by the first metal braided filter screen 21a Water; and a track 226a, located on the base 223a; and a first support structure 222a, a seat that can slide along the track 226a, connected to a power assembly (not shown); and a first The backwash injection structure 221a is arranged on the first support structure 222a and is located below the first metal braided filter screen 21a; the first backwash spray structure 221a has at least one jet directed towards the first metal braided filter screen 21a Hole (not shown in the figure), can make its sprayed fluid pass through this first metal braided filter screen 21a; 21a and above the first backwash injection structure 221a.

As shown in Figure 7, the second metal braided filter screen 41a of the second microfiltration structure 4a can be a flat filter membrane; the second circulation backwash structure 42a can further include: a base 423a, on which the first Two metal woven filter screens 41a; the second metal woven filter screen 41a is in an inclined state and has a high side 411a and a low side 412a; and a water supply assembly 424a, connected to the aerobic biological reaction structure to receive the third treated water, and then supply the third treated water to the high side 411a of the second metal braided filter screen 41a, the third treated water along the The high side 411a of the second metal braided filter screen 41a flows to the low side 412a, and is separated by solid and liquid to form the fourth treated water and the second sludge. The fourth treated water passes through the second metal braided screen 41a, and the second The sludge is separated from the direction of the low side 412a of the second metal braided filter screen 41a; and a first collection assembly 425a is used to collect the fourth treated water passing through the second metal braided filter screen 41a; and a track 426a is set On the base 423a; and a second supporting structure 422a, which is a seat body that can slide along the track 426a, connected to a power unit (not shown); and a second backwash injection structure 421a, located on On the second supporting structure 422a, and below the second metal braided filter screen 41a; the second backwash injection structure 421a has at least one spray hole (not shown) facing the second metal braided filter screen 41a, The sprayed fluid can pass through the second metal braided filter screen 41a; and a baffle plate 427a is arranged on the second support structure 422a, and is located at the second metal braided screen screen 41a and the second backwash injection structure 421a above.

Fig. 8 shows a second variant embodiment of the first microfiltration structure of the present invention. Fig. 9 shows a second variant embodiment of the second microfiltration structure of the present invention. As shown in Figures 8 to 9, the first microfiltration structure 2b and/or the second microfiltration structure 4b can further form a filtration structure (its structure can be roughly the same as that of the applicant of the present invention in Taiwan Patent Application No. 109123504, No. 109208852 The disclosed filtering structure and its application are the same), so as to increase the efficacy of the first microfiltration structure and the second microfiltration structure.

As shown in Figure 8, the first metal braided filter screen 21b of the first microfiltration structure 2b can be tubular, with a first end 213b, a second end 214b and a first space 215b; the first microfiltration structure 2b The first circulating backwashing structure 22b may further include: a first closing plate 228b, which is located at the first end 213b of the first metal braided filter screen 21b, and has a first opening 2281b; and a second closing plate 229b, which is provided At the second end 214b of the first metal braided filter screen 21b; and a first support structure 222b, which is a tubular body, has a first end 2221b and a second end 2222b, and the first end 2221b of the first support structure 222b Rotatable and pivotally arranged on the first closing plate 228b; and at least one first backwash injection structure 221b, which is composed of a first communication pipe 2212b and a first water spray pipe 2213b; the first communication pipe 2212b The first support structure 222b and the first water spray pipe 2213b are connected, and the first water spray pipe 2213b is arranged near the first metal braided filter screen 21b; the pipe wall of the first water spray pipe 2213b has many The first water spout (not shown) of a metal braided filter screen 21b; And a backwash pump 230b has a first water inlet pipe 2301b and a first water outlet pipe 2302b, and the first water outlet pipe 2302b communicates with the first water outlet pipe 2302b. The support structure 222b is used to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe 2213b; There is a storage space 2311b between a metal braided filter screen 21b, and the storage space 2311b of the storage tank 231b is connected to the pre-treatment structure to receive the first treated water, so that the first treated water is separated into solid and liquid to form the second treated water and The first sludge and the second treated water pass through the first metal woven filter screen 21b, and the first sludge settles at the bottom of the storage space 2311b of the storage tank 231b; and a outlet A water pipe 232b communicates with the first opening 2281b of the first closing plate 228b and the outside of the storage tank 231b to discharge the second treated water; and a sewage pipe 233b communicates with the bottom of the storage space 2311b of the storage tank 231b to discharge the first sludge.

As shown in Figure 9, the second metal braided filter screen 41b of the second microfiltration structure 4b can be tubular, with a first end 413b, a second end 414b and a first space 415b; the second microfiltration structure 4b The second circulating backwashing structure 42b may further include: a first closing plate 428b, which is arranged on the first end 413b of the second metal braided filter screen 41b, and has a first opening 4281b; and a second closing plate 429b, which is set At the second end 414b of the second metal braided filter screen 41b; and a second support structure 422b, which is a tubular body, has a first end 4221b and a second end 4222b, and the first end 4221b of the second support structure 422b Rotatable and pivotally arranged on the first closing plate 428b; and at least one second backwash injection structure 421b, which is composed of a first communication pipe 4212b and a first water spray pipe 4213b; the first communication pipe 4212b The second support structure 422b and the first water spray pipe 4213b are connected, and the first water spray pipe 4213b is arranged near the second metal braided filter screen 41b; the pipe wall of the first water spray pipe 4213b has many The first water spout (not shown) of two metal braided filter screens 41b; And a backwash pump 430b has a first water inlet pipe 4301b and a first water outlet pipe 4302b, and the first water outlet pipe 4302b communicates with the second water outlet pipe 4302b. The support structure 422b is used to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe 4213b; There is a storage space 4311b between the two metal braided filter screens 41b, and the storage space 4311b of the storage tank 431b is connected to the aerobic bioreactor It should be structured to receive the third treated water, so that the third treated water is separated from solid and liquid to form fourth treated water and second sludge, the fourth treated water passes through the second metal woven filter screen 41b, and the second sludge is deposited At the bottom of the storage space 4311b of the storage tank 431b; and a water outlet pipe 432b, which communicates with the first opening 4281b of the first closing plate 428b and the outside of the storage tank 431b to discharge the fourth treated water; and a sewage pipe 433b, which communicates The bottom of the storage space 4311b of the storage tank 431b is used to discharge the second sludge.

The above are the embodiments of the present invention, which are only for convenience of description, and should not limit the meaning of the present invention, that is, all the various transformation designs made according to the scope of the listed patent application should be included in the scope of the present invention. middle.

100: Sewage treatment plant

1: Pre-processing structure

11: Sewage source

2: The first microfiltration structure

3: Aerobic biological reaction structure

4: The second microfiltration structure

5: Mixed and concentrated structure

6: Anaerobic biological digestion structure

Claims (6)

A sewage treatment method, which comprises the following steps: a1) The previous treatment structure treats the sewage to generate the first treated water; a2) Filtrating the first treated water with a first microfiltration structure to generate second treated water and first sludge; the first microfiltration structure contains a first metal braided filter screen and a first circulating backwashing structure; a3) Treating the second treated water with an aerobic biological reaction structure to generate third treated water; a4) filtering the third treated water with a second microfiltration structure to produce fourth treated water and second sludge; the second microfiltration structure contains a second metal braided filter screen and a second circulating backwashing structure; a5) processing the first sludge and the second sludge with a mixing and concentration structure to generate a third sludge; a6) Treating the third sludge with an anaerobic biological digestion structure to generate methane and fourth sludge. A sewage treatment plant, comprising: A pre-treatment structure, connected to a sewage source, capable of filtering the sewage from the sewage source to produce first treated water; A first micro-filtration structure, connected to the pre-treatment structure to receive the first treated water, has a first metal woven filter screen and a first circulating backwash structure, which can filter the first treated water to generate second treated water and first sludge; an aerobic biological reaction structure, connected to the first microfiltration structure to receive the second treated water, capable of treating the second treated water with an aerobic biological reaction water to produce third treated water; A second microfiltration structure, connected to the aerobic biological reaction structure to receive the third treated water, has a second metal woven filter screen and a second circulation backwash structure, which can filter the third treated water to produce a fourth Treatment of water and secondary sludge; A mixing and concentrating structure, connecting the first microfiltration structure and the second microfiltration structure to receive the first sludge and the second sludge, capable of mixing and concentrating the first sludge and the second sludge to produce a third sludge; and An anaerobic biological digestion structure, connected to the mixing and thickening structure to receive the third sludge, can treat the third sludge with anaerobic biological digestion to produce methane and fourth sludge. Such as the sewage treatment device of claim 2, wherein the first metal woven filter screen of the first microfiltration structure is a flat filter membrane; the first circulating backwashing structure further includes: a base on which There is the first metal woven filter screen, the first metal woven filter screen is inclined and has a high side and a low side; and a water supply component, connected to the pre-treatment structure to receive the first treated water, and then to the The high side of the first metal braided filter screen supplies the first treated water, and the first treated water flows along the high side of the first metal braided screen to the low side, and is separated by solid and liquid to form the second treated water and the first treated water. A sludge, the second treated water passes through the first metal woven filter, and the first sludge is separated from the lower side of the first metal woven filter; and a first collecting component is used to collect The second treated water of the first metal braided filter screen; and a track, which is arranged on the base; and a first support structure, which is a seat body that can slide along the track, and is connected with a power assembly; and a first backwash injection structure, which is arranged on the first support structure and located below the first metal braided filter screen, and the first backwash injection structure has at least one nozzle facing the first metal braided filter screen a spray hole, which allows the sprayed fluid to pass through the first metal braided filter; and a baffle, which is arranged on the first support structure and is located above the first metal braided filter and the first backwash spray structure . Such as the sewage treatment device of claim 2, wherein the second metal woven filter screen of the second microfiltration structure is a flat filter membrane; the second circulating backwashing structure may further include: a base, on which The second metal woven filter screen is provided, the second metal woven filter screen is inclined and has a high side and a low side; and a water supply component connected to the aerobic biological reaction structure to receive the third treated water, Furthermore, the third treated water is supplied to the high side of the second metal braided filter screen, and the third treated water flows along the high side to the low side of the second metal braided screen screen, and is separated by solid and liquid to form a fourth treated water and second sludge, the fourth treated water passes through the second metal woven filter, and the second sludge is separated from the lower side of the second metal woven filter; and a first collection component for collecting The fourth treated water passing through the second metal woven filter screen; and a track, which is arranged on the base; and a second support structure, which is a seat body that can slide along the track, and is connected to a power component; and a The second backwash injection structure is arranged on the second support structure and is located under the second metal woven filter screen; the second backwash injection structure has at least one injection hole facing the second metal woven filter screen, which can making the sprayed fluid pass through the second metal braided screen; and a baffle, which is arranged on the second support structure and located Above the woven filter screen and the second backwash jet structure. Such as the sewage treatment device of claim 2, wherein the first metal braided filter screen of the first microfiltration structure is tubular, has a first end, a second end and a first space; the first circulating backwashing structure It may further include: a first closing plate, arranged at the first end of the first metal braided filter screen, and having a first opening; and a second closing plate, arranged at the second end of the first metal braided filter screen end; and a first support structure, which is a tubular body, has a first end and a second end, and the first end of the first support structure is rotatably pivoted on the first closing plate; and at least one first The backwash injection structure is composed of a first communication pipe and a first water spray pipe, the first communication pipe communicates with the first support structure and the first water spray pipe, and the first water spray pipe is located close to At the first metal braided filter screen, the wall of the first water spray pipe has many first water spray ports facing the first metal braided screen; and a backwash pump has a first water inlet pipe and a first a water outlet pipe, the first water outlet pipe communicates with the first support structure to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank, covered by the first metal braid In addition to the filter screen, there is a storage space between the first metal woven filter screen, and the storage space of the storage tank is connected to the pre-treatment structure to receive the first treated water, so that the first treated water is separated from solid and liquid Forming second treated water and first sludge, the second treated water passes through the first metal woven filter, and the first sludge settles at the bottom of the storage space of the storage tank; and an outlet pipe communicates with the first a first opening of the closing plate and the outside of the storage tank to discharge the second treated water; and a sewage pipe communicating with the bottom of the storage space of the storage tank to discharge the first sludge. Such as the sewage treatment device of claim 2, wherein the second metal braided filter screen of the second microfiltration structure is tubular, has a first end, a second end and a first space; the second circulating backwashing structure It may further include: a first closed plate, arranged at the first end of the second metal woven filter screen, having a first opening; and a second closed plate, provided at the second end of the second metal woven filter screen ; and a second support structure, which is a tubular body with a first end and a second end, the first end of the second support structure is rotatably pivoted on the first closing plate; and at least one second counter The flushing injection structure is composed of a first communication pipe and a first water spray pipe; the first communication pipe communicates with the second support structure and the first water spray pipe, and makes the first water spray pipe located near the At the second metal braided filter screen; the pipe wall of the first water spray pipe has many first water spray ports facing the second metal braided filter screen; and a backwash pump has a first water inlet pipe and a first outlet A water pipe, the first water outlet pipe communicates with the second support structure to inject pressurized water, so that the pressurized water is sprayed from the first water spray port of the first water spray pipe; and a storage tank, coated on the second metal braided filter In addition to the net, there is a storage space between the second metal woven filter screen, the storage space of the storage tank is connected to the aerobic biological reaction structure to receive the third treated water, so that the third treated water is separated from solid and liquid And form the fourth treatment water and the second sludge, the fourth treatment water passes through the second metal woven filter screen, and the second sludge settles at the bottom of the storage space of the storage tank; and an outlet pipe communicates with the the first opening of the first closing plate and the outside of the storage tank to discharge the fourth treated water; and a sewage pipe connected to the bottom of the storage space of the storage tank to discharge the second sludge.

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